Finding the sum of 7 numbers with the mean of 63, simply multiply 7 times 63 to get 441. To prove it I will use the of sum of 7 consecutive numbers, letting the first number be n, 2nd number n+1, 3rd number n+2, 4th number n+3, 5th number n+4, 6th number n+5 and 7th number n+6. read more